Exodus 12:48-50

New Century Version

⁴⁸ A foreigner who lives with you may share in the Lord’s Passover if all the males in his house become circumcised. Then, since he will be like a citizen of Israel, he may share in the meal. But a man who is not circumcised may not eat the Passover meal. ⁴⁹ The same rules apply to an Israelite born in the country or to a foreigner living there.”

⁵⁰ So all the Israelites did just as the Lord had commanded Moses and Aaron.